Getting to Europe Using the Fewest Frequent-Flyer Miles

It’s not widely known that different airline programs charge different amounts of frequent-flyer miles for the same routes. For example, to fly Business Class from USA and Europe can cost 70,000 Delta SkyMiles, or just 37,500 British Air Avios. And, there are some smart ways to earn BA Avios even if you fly other airlines (like American).